ath9k: Check the return value of pcie_capability_read_*()

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On failure pcie_capability_read_dword() sets it's last parameter, val
to 0. However, with Patch 14/14, it is possible that val is set to ~0 on
failure. This would introduce a bug because (x & x) == (~0 & x).

This bug can be avoided without changing the function's behaviour if the
return value of pcie_capability_read_dword is checked to confirm success.

Check the return value of pcie_capability_read_dword() to ensure success.

Suggested-by: Bjorn Helgaas <bjorn@helgaas.com>
Signed-off-by: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200713175529.29715-2-refactormyself@gmail.com

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Bolarinwa Olayemi Saheed 2020-07-13 19:55:26 +02:00 • committed by Kalle Valo

parent a9bf090932

commit 9a8ab2bfb6

1 changed files with 3 additions and 2 deletions

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drivers/net/wireless/ath/ath9k/pci.c

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