From ec79be26875f6c1468784876cb99192b7f41c7a5 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Wed, 29 Jul 2009 21:07:47 +0200 Subject: [PATCH 1/2] PM / ACPI: HP G7000 Notebook needs a SCI_EN resume quirk This fixes regression (battery "vanishing" on resume) introduced by commit d0c71fe7ebc180f1b7bc7da1d39a07fc19eec768 ("ACPI Suspend: Enable ACPI during resume if SCI_EN is not set") and also the issue with the "screaming" IRQ 9. Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13745 Reported-and-tested-by: Alan Jenkins Cc: stable@kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz Acked-by: Len Brown Signed-off-by: Rafael J. Wysocki --- drivers/acpi/sleep.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 01574a066534..42159a28f433 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -397,6 +397,14 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = { }, }, { + .callback = init_set_sci_en_on_resume, + .ident = "Hewlett-Packard HP G7000 Notebook PC", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP G7000 Notebook PC"), + }, + }, + { .callback = init_old_suspend_ordering, .ident = "Panasonic CF51-2L", .matches = { From dddac6a7b445de95515f64fdf82fe5dc36c02f26 Mon Sep 17 00:00:00 2001 From: Alan Jenkins Date: Wed, 29 Jul 2009 21:07:55 +0200 Subject: [PATCH 2/2] PM / Hibernate: Replace bdget call with simple atomic_inc of i_count Create bdgrab(). This function copies an existing reference to a block_device. It is safe to call from any context. Hibernation code wishes to copy a reference to the active swap device. Right now it calls bdget() under a spinlock, but this is wrong because bdget() can sleep. It doesn't need a full bdget() because we already hold a reference to active swap devices (and the spinlock protects against swapoff). Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827 Signed-off-by: Alan Jenkins Signed-off-by: Rafael J. Wysocki --- fs/block_dev.c | 10 ++++++++++ include/linux/fs.h | 1 + mm/swapfile.c | 4 ++-- 3 files changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 3a6d4fb2a329..94dfda24c06e 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -564,6 +564,16 @@ struct block_device *bdget(dev_t dev) EXPORT_SYMBOL(bdget); +/** + * bdgrab -- Grab a reference to an already referenced block device + * @bdev: Block device to grab a reference to. + */ +struct block_device *bdgrab(struct block_device *bdev) +{ + atomic_inc(&bdev->bd_inode->i_count); + return bdev; +} + long nr_blockdev_pages(void) { struct block_device *bdev; diff --git a/include/linux/fs.h b/include/linux/fs.h index 0872372184fe..a36ffa5a77a4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1946,6 +1946,7 @@ extern void putname(const char *name); extern int register_blkdev(unsigned int, const char *); extern void unregister_blkdev(unsigned int, const char *); extern struct block_device *bdget(dev_t); +extern struct block_device *bdgrab(struct block_device *bdev); extern void bd_set_size(struct block_device *, loff_t size); extern void bd_forget(struct inode *inode); extern void bdput(struct block_device *); diff --git a/mm/swapfile.c b/mm/swapfile.c index d1ade1a48ee7..8ffdc0d23c53 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -753,7 +753,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p) if (!bdev) { if (bdev_p) - *bdev_p = bdget(sis->bdev->bd_dev); + *bdev_p = bdgrab(sis->bdev); spin_unlock(&swap_lock); return i; @@ -765,7 +765,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p) struct swap_extent, list); if (se->start_block == offset) { if (bdev_p) - *bdev_p = bdget(sis->bdev->bd_dev); + *bdev_p = bdgrab(sis->bdev); spin_unlock(&swap_lock); bdput(bdev);