On Fri, 2016-14-10 at 09:38:36 UTC, Vaibhav Jain wrote:
This patch prevents resetting the cxl adapter via sysfs in presence of
one or more active cxl_context on it. This protects against an
unrecoverable error caused by PSL owning a dirty cache line even after
reset and host tries to touch the same cache line. In case a force reset
of the card is required irrespective of any active contexts, the int
value -1 can be stored in the 'reset' sysfs attribute of the card.
The patch introduces a new atomic_t member named contexts_num inside
struct cxl that holds the number of active context attached to the card
, which is checked against '0' before proceeding with the reset. To
prevent against a race condition where a context is activated just after
reset check is performed, the contexts_num is atomically set to '-1'
after reset-check to indicate that no more contexts can be activated on
the card anymore.
Before activating a context we atomically test if contexts_num is
non-negative and if so, increment its value by one. In case the value of
contexts_num is negative then it indicates that the card is about to be
reset and context activation is error-ed out at that point.
Cc: <redacted>
Fixes: 62fa19d4 ("cxl: Add ability to reset the card")
Acked-by: Frederic Barrat <redacted>
Reviewed-by: Andrew Donnellan <redacted>
Signed-off-by: Vaibhav Jain <redacted>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/70b565bbdb911023373e035225ab10
cheers