Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0b5de96858e516311f2d3ca45073c2afd2eb5d94
Commit: 0b5de96858e516311f2d3ca45073c2afd2eb5d94
Parent: e90d0b3daede2bae2e78f8bf88c19182961cd19d
Author: Joachim Fenkes <[EMAIL PROTECTED]>
AuthorDate: Tue Sep 11 15:34:35 2007 +0200
Committer: Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Tue Oct 9 19:59:11 2007 -0700
IB/ehca: Serialize MR alloc and MR free hvCalls
Some firmware levels exhibit a race condition between H_ALLOC_RESOURCE(MR)
and H_FREE_RESOURCE(MR). Work around this problem by locking these hvCalls
against each other.
Signed-off-by: Joachim Fenkes <[EMAIL PROTECTED]>
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
---
drivers/infiniband/hw/ehca/hcp_if.c | 28 +++++++++++++++++++++-------
1 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/drivers/infiniband/hw/ehca/hcp_if.c
b/drivers/infiniband/hw/ehca/hcp_if.c
index 3d68f65..c16a213 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.c
+++ b/drivers/infiniband/hw/ehca/hcp_if.c
@@ -120,15 +120,28 @@ static long ehca_plpar_hcall_norets(unsigned long opcode,
unsigned long arg7)
{
long ret;
- int i, sleep_msecs;
+ int i, sleep_msecs, do_lock;
+ unsigned long flags;
ehca_gen_dbg("opcode=%lx " HCALL7_REGS_FORMAT,
opcode, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
+ /* lock H_FREE_RESOURCE(MR) against itself and H_ALLOC_RESOURCE(MR) */
+ if ((opcode == H_FREE_RESOURCE) && (arg7 == 5)) {
+ arg7 = 0; /* better not upset firmware */
+ do_lock = 1;
+ }
+
for (i = 0; i < 5; i++) {
+ if (do_lock)
+ spin_lock_irqsave(&hcall_lock, flags);
+
ret = plpar_hcall_norets(opcode, arg1, arg2, arg3, arg4,
arg5, arg6, arg7);
+ if (do_lock)
+ spin_unlock_irqrestore(&hcall_lock, flags);
+
if (H_IS_LONG_BUSY(ret)) {
sleep_msecs = get_longbusy_msecs(ret);
msleep_interruptible(sleep_msecs);
@@ -161,23 +174,24 @@ static long ehca_plpar_hcall9(unsigned long opcode,
unsigned long arg9)
{
long ret;
- int i, sleep_msecs, lock_is_set = 0;
+ int i, sleep_msecs, do_lock;
unsigned long flags = 0;
ehca_gen_dbg("INPUT -- opcode=%lx " HCALL9_REGS_FORMAT, opcode,
arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9);
+ /* lock H_ALLOC_RESOURCE(MR) against itself and H_FREE_RESOURCE(MR) */
+ do_lock = ((opcode == H_ALLOC_RESOURCE) && (arg2 == 5));
+
for (i = 0; i < 5; i++) {
- if ((opcode == H_ALLOC_RESOURCE) && (arg2 == 5)) {
+ if (do_lock)
spin_lock_irqsave(&hcall_lock, flags);
- lock_is_set = 1;
- }
ret = plpar_hcall9(opcode, outs,
arg1, arg2, arg3, arg4, arg5,
arg6, arg7, arg8, arg9);
- if (lock_is_set)
+ if (do_lock)
spin_unlock_irqrestore(&hcall_lock, flags);
if (H_IS_LONG_BUSY(ret)) {
@@ -807,7 +821,7 @@ u64 hipz_h_free_resource_mr(const struct ipz_adapter_handle
adapter_handle,
return ehca_plpar_hcall_norets(H_FREE_RESOURCE,
adapter_handle.handle, /* r4 */
mr->ipz_mr_handle.handle, /* r5 */
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0, 5);
}
u64 hipz_h_reregister_pmr(const struct ipz_adapter_handle adapter_handle,
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
