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libflash/ipmi-hiomap: Overhaul event handling
[ Upstream commit 403d527 ] Reworking the event handling was inspired by a bug report by Vasant where the host would get wedged on multiple flash access attempts in the face of a persistent error state on the BMC-side. The cause of this bug was the early-exit based on ctx->update, which erronously assumed that all events had been completely handled in prior calls to ipmi_hiomap_handle_events(). This is not true if e.g. HIOMAP_E_DAEMON_READY is clear in the prior calls. Regardless, there were other correctness and efficiency problems with the handling strategy: * Ack-able event state was not restored in the face of errors in the process of re-establishing protocol state * It forced needless window restoration with respect to the context in which ipmi_hiomap_handle_events() was called. * Tests for HIOMAP_E_DAEMON_READY and HIOMAP_E_FLASH_LOST were redundant with the overhauled error handling introduced in the previous patch Fix all of the above issues and add comments to explain the event handling flow. Tests for correctness follow later in the series. Cc: stable Cc: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Stewart Smith <stewart@linux.ibm.com> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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