6889ea7b9a
The interrupt handler reads from the mailbox if no other reason for the interrupt is known. If a spurious interrupt is received just after a mailbox message has been sent, this means that the response to the previous message is read again and returned by DSL_BSP_SendCMV instead of the actual response. To fix this, check the status register before reading from the mailbox in the interrupt handler. Tested on Fritzbox 7320. Without this change, there is occasionally a kernel panic due to an out-of-bounds memory access in the ltq-adsl driver (in DSL_DRV_DEV_G997_SnrAllocationNscGet), as a result of an incorrect value returned by DSL_DRV_DANUBE_CmvRead. This is reproducible by calling "dsl_cpe_pipe.sh g997dsnrg 1 1" multiple times. Signed-off-by: Jan Hoffmann <jan@3e8.eu> Link: https://github.com/openwrt/openwrt/pull/19385 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
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