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Arm FF-A fix for v6.15

Browse Source 
A fix that addresses incorrect release of Rx buffer ownership in the
 driver. The fix specificially avoids releasing Rx buffer ownership with
 FFA_RX_RELEASE if it wasn’t acquired during a FFA_PARTITION_INFO_GET call
 that only requested the partition count. This prevents unnecessary errors
 like FFA_RET_DENIED from firmware when buffers are not actually owned by
 the driver.
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Merge tag 'ffa-fix-6.15' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm FF-A fix for v6.15

A fix that addresses incorrect release of Rx buffer ownership in the
driver. The fix specificially avoids releasing Rx buffer ownership with
FFA_RX_RELEASE if it wasn’t acquired during a FFA_PARTITION_INFO_GET call
that only requested the partition count. This prevents unnecessary errors
like FFA_RET_DENIED from firmware when buffers are not actually owned by
the driver.

* tag 'ffa-fix-6.15' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Skip Rx buffer ownership release if not acquired
This commit is contained in:
Arnd Bergmann 2025-04-29 18:14:19 +02:00
commit fbefe1c45d
1 changed files with 2 additions and 1 deletions
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3
drivers/firmware/arm_ffa/driver.c
View File

@ -299,7 +299,8 @@ __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
import_uuid(&buf->uuid, (u8 *)&rx_buf->uuid);
}
ffa_rx_release();
if (!(flags & PARTITION_INFO_GET_RETURN_COUNT_ONLY))
ffa_rx_release();
mutex_unlock(&drv_info->rx_lock);