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sfc: Explain why efx_mcdi_exit_assertion() ignores result of efx_mcdi_rpc() 

Fix CID 113952 in Coverity report on Linux.

This is the one instance where we don't, and shouldn't, check the
return code from efx_mcdi_rpc().  It wasn't immediately obvious to me
why we didn't, so I think an explanation is in order.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-07-02 23:37:40 +01:00
parent e3ed2bdfc4
commit 0f1e54ae52
1 changed files with 8 additions and 3 deletions
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9
drivers/net/ethernet/sfc/mcdi.c
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@ -1001,11 +1001,16 @@ static void efx_mcdi_exit_assertion(struct efx_nic *efx)
{ {
u8 inbuf[MC_CMD_REBOOT_IN_LEN]; u8 inbuf[MC_CMD_REBOOT_IN_LEN];
/* Atomically reboot the mcfw out of the assertion handler */ /* If the MC is running debug firmware, it might now be
* waiting for a debugger to attach, but we just want it to
* reboot. We set a flag that makes the command a no-op if it
* has already done so. We don't know what return code to
* expect (0 or -EIO), so ignore it.
*/
BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0); BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION); MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN, (void) efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
NULL, 0, NULL); NULL, 0, NULL);
} }