mirror of https://gitee.com/openkylin/linux.git
drivers/block/umem: minor cleanups
* tab-align DRIVER_*, pci_driver entries * reduced wasted memory by killing unused struct cardinfo members * move free_irq() call above resource unmap, to fix tiny window where irq handler may access recently-unmapped memory * propagate pci_enable_device() return value * use pci_request_regions, pci_release_regions() for resource reservation * call pci_disable_device() in pci_driver::remove() Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeff Garzik
Jens Axboe
parent
4e0af881af
commit
ee4a7b6874
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@ -67,9 +67,10 @@
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* Version Information
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*/
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#define DRIVER_VERSION "v2.3"
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#define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown"
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#define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver"
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#define DRIVER_NAME "umem"
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#define DRIVER_VERSION "v2.3"
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#define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown"
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#define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver"
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static int debug;
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/* #define HW_TRACE(x) writeb(x,cards[0].csr_remap + MEMCTRLSTATUS_MAGIC) */
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@ -99,12 +100,7 @@ static int major_nr;
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struct cardinfo {
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struct pci_dev *dev;
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int irq;
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unsigned long csr_base;
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unsigned char __iomem *csr_remap;
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unsigned long csr_len;
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unsigned int win_size; /* PCI window size */
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unsigned int mm_size; /* size in kbytes */
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unsigned int init_size; /* initial segment, in sectors,
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@ -869,22 +865,27 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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unsigned char mem_present;
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unsigned char batt_status;
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unsigned int saved_bar, data;
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unsigned long csr_base;
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unsigned long csr_len;
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int magic_number;
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static int printed_version;
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if (!printed_version++)
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printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n");
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if (pci_enable_device(dev) < 0)
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return -ENODEV;
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ret = pci_enable_device(dev);
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if (ret)
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return ret;
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pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8);
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pci_set_master(dev);
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card->dev = dev;
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card->csr_base = pci_resource_start(dev, 0);
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card->csr_len = pci_resource_len(dev, 0);
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csr_base = pci_resource_start(dev, 0);
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csr_len = pci_resource_len(dev, 0);
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if (!csr_base || !csr_len)
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return -ENODEV;
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dev_printk(KERN_INFO, &dev->dev,
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"Micro Memory(tm) controller found (PCI Mem Module (Battery Backup))\n");
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@ -894,15 +895,15 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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dev_printk(KERN_WARNING, &dev->dev, "NO suitable DMA found\n");
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return -ENOMEM;
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}
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if (!request_mem_region(card->csr_base, card->csr_len, "Micro Memory")) {
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ret = pci_request_regions(dev, DRIVER_NAME);
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if (ret) {
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dev_printk(KERN_ERR, &card->dev->dev,
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"Unable to request memory region\n");
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ret = -ENOMEM;
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goto failed_req_csr;
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}
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card->csr_remap = ioremap_nocache(card->csr_base, card->csr_len);
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card->csr_remap = ioremap_nocache(csr_base, csr_len);
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if (!card->csr_remap) {
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dev_printk(KERN_ERR, &card->dev->dev,
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"Unable to remap memory region\n");
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@ -913,7 +914,7 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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dev_printk(KERN_INFO, &card->dev->dev,
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"CSR 0x%08lx -> 0x%p (0x%lx)\n",
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card->csr_base, card->csr_remap, card->csr_len);
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csr_base, card->csr_remap, csr_len);
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switch(card->dev->device) {
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case 0x5415:
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@ -1028,9 +1029,6 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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data = ~data;
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data += 1;
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card->win_size = data;
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if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, "pci-umem", card)) {
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dev_printk(KERN_ERR, &card->dev->dev,
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"Unable to allocate IRQ\n");
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@ -1039,10 +1037,8 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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goto failed_req_irq;
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}
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card->irq = dev->irq;
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dev_printk(KERN_INFO, &card->dev->dev,
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"Window size %d bytes, IRQ %d\n",
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card->win_size, card->irq);
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"Window size %d bytes, IRQ %d\n", data, dev->irq);
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spin_lock_init(&card->lock);
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@ -1089,7 +1085,7 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_i
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failed_magic:
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iounmap(card->csr_remap);
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failed_remap_csr:
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release_mem_region(card->csr_base, card->csr_len);
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pci_release_regions(dev);
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failed_req_csr:
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return ret;
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@ -1104,9 +1100,8 @@ static void mm_pci_remove(struct pci_dev *dev)
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struct cardinfo *card = pci_get_drvdata(dev);
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tasklet_kill(&card->tasklet);
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free_irq(dev->irq, card);
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iounmap(card->csr_remap);
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release_mem_region(card->csr_base, card->csr_len);
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free_irq(card->irq, card);
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if (card->mm_pages[0].desc)
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pci_free_consistent(card->dev, PAGE_SIZE*2,
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@ -1117,6 +1112,9 @@ static void mm_pci_remove(struct pci_dev *dev)
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card->mm_pages[1].desc,
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card->mm_pages[1].page_dma);
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blk_cleanup_queue(card->queue);
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pci_release_regions(dev);
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pci_disable_device(dev);
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}
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static const struct pci_device_id mm_pci_ids[] = {
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@ -1136,11 +1134,12 @@ static const struct pci_device_id mm_pci_ids[] = {
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MODULE_DEVICE_TABLE(pci, mm_pci_ids);
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static struct pci_driver mm_pci_driver = {
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.name = "umem",
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.id_table = mm_pci_ids,
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.probe = mm_pci_probe,
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.remove = mm_pci_remove,
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.name = DRIVER_NAME,
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.id_table = mm_pci_ids,
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.probe = mm_pci_probe,
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.remove = mm_pci_remove,
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};
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/*
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-----------------------------------------------------------------------------------
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-- mm_init
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