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igc: Fix infinite loop in release_swfw_sync

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backport from 907862e9ae

Signed-off-by: Jim Ma <majinjing3@gmail.com>
This commit is contained in:
Jim Ma 2022-10-27 02:05:01 +08:00
parent 8637c18ef5
commit e52503cd8f
1 changed files with 9 additions and 2 deletions
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11
igc_i225.c
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@ -156,8 +156,15 @@ void igc_release_swfw_sync_i225(struct igc_hw *hw, u16 mask)
{
u32 swfw_sync;
while (igc_get_hw_semaphore_i225(hw))
; /* Empty */
/* Releasing the resource requires first getting the HW semaphore.
* If we fail to get the semaphore, there is nothing we can do,
* except log an error and quit. We are not allowed to hang here
* indefinitely, as it may cause denial of service or system crash.
*/
if (igc_get_hw_semaphore_i225(hw)) {
hw_dbg("Failed to release SW_FW_SYNC.\n");
return;
}
swfw_sync = rd32(IGC_SW_FW_SYNC);
swfw_sync &= ~mask;