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drm/i915: Fix copy_to_user usage for pipe_crc 

Copy to user return the number of bytes it couldn't write
and zero on success. So any number different than 0 should
be considered a fault, not only when it doesn't write
the full size.

v2: fixed the inverted logic. (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Rodrigo Vivi 2016-08-03 08:22:57 -07:00
parent 19e0b4cab9
commit 4e9121e6b4
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/i915/i915_debugfs.c
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@ -3625,7 +3625,6 @@ i915_pipe_crc_read(struct file *filep, char __user *user_buf, size_t count,
while (n_entries > 0) {
struct intel_pipe_crc_entry *entry =
&pipe_crc->entries[pipe_crc->tail];
int ret;
if (CIRC_CNT(pipe_crc->head, pipe_crc->tail,
INTEL_PIPE_CRC_ENTRIES_NR) < 1)
@ -3642,8 +3641,7 @@ i915_pipe_crc_read(struct file *filep, char __user *user_buf, size_t count,
spin_unlock_irq(&pipe_crc->lock);
ret = copy_to_user(user_buf, buf, PIPE_CRC_LINE_LEN);
if (ret == PIPE_CRC_LINE_LEN)
if (copy_to_user(user_buf, buf, PIPE_CRC_LINE_LEN))
return -EFAULT;
user_buf += PIPE_CRC_LINE_LEN;