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fw_cfg: fix sparse warnings in fw_cfg_sel_endianness() 

Dispatch to the appropriate iowrite() instead of casting restricted
type to u16.

- if fw_cfg_is_mmio:
  before: iowrite16(cpu_to_be16(key))
  after: iowrite16be(key)
- if !fw_cfg_is_mmio:
  before: iowrite16(cpu_to_le16(key))
  after: iowrite16(key)
  which is equivalent on little-endian systems, where fw_cfg IO is supported.

Fixes:
$ make C=1 CF=-D__CHECK_ENDIAN__ drivers/firmware/qemu_fw_cfg.o

drivers/firmware/qemu_fw_cfg.c:55:33: warning: restricted __be16 degrades to integer
drivers/firmware/qemu_fw_cfg.c:55:52: warning: restricted __le16 degrades to integer

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-02-28 16:06:05 +01:00 committed by Michael S. Tsirkin
parent c8f06a0668
commit 8d59d5bd8f
1 changed files with 6 additions and 3 deletions
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9
drivers/firmware/qemu_fw_cfg.c
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@ -68,9 +68,12 @@ static void __iomem *fw_cfg_reg_data;
static DEFINE_MUTEX(fw_cfg_dev_lock);
/* pick appropriate endianness for selector key */
static inline u16 fw_cfg_sel_endianness(u16 key)
static void fw_cfg_sel_endianness(u16 key)
{
return fw_cfg_is_mmio ? cpu_to_be16(key) : cpu_to_le16(key);
if (fw_cfg_is_mmio)
iowrite16be(key, fw_cfg_reg_ctrl);
else
iowrite16(key, fw_cfg_reg_ctrl);
}
/* read chunk of given fw_cfg blob (caller responsible for sanity-check) */
@ -92,7 +95,7 @@ static inline void fw_cfg_read_blob(u16 key,
}
mutex_lock(&fw_cfg_dev_lock);
iowrite16(fw_cfg_sel_endianness(key), fw_cfg_reg_ctrl);
fw_cfg_sel_endianness(key);
while (pos-- > 0)
ioread8(fw_cfg_reg_data);
ioread8_rep(fw_cfg_reg_data, buf, count);