This is a note to let you know that I've just added the patch titled IB/mlx5: avoid destroying a NULL mr in reg_user_mr error flow to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ib-mlx5-avoid-destroying-a-null-mr-in-reg_user_mr-error-flow.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 11d748045c6dadb279d1acdb6d2ea8f3f2ede85b Mon Sep 17 00:00:00 2001 From: Haggai Eran <haggaie@xxxxxxxxxxxx> Date: Tue, 1 Sep 2015 09:56:56 +0300 Subject: IB/mlx5: avoid destroying a NULL mr in reg_user_mr error flow From: Haggai Eran <haggaie@xxxxxxxxxxxx> commit 11d748045c6dadb279d1acdb6d2ea8f3f2ede85b upstream. The mlx5_ib_reg_user_mr() function will attempt to call clean_mr() in its error flow even though there is never a case where the error flow occurs with a valid MR pointer to destroy. Remove the clean_mr() call and the incorrect comment above it. Fixes: b4cfe447d47b ("IB/mlx5: Implement on demand paging by adding support for MMU notifiers") Cc: Eli Cohen <eli@xxxxxxxxxxxx> Signed-off-by: Haggai Eran <haggaie@xxxxxxxxxxxx> Reviewed-by: Sagi Grimberg <sagig@xxxxxxxxxxxx> Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/infiniband/hw/mlx5/mr.c | 12 ------------ 1 file changed, 12 deletions(-) --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1118,19 +1118,7 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct return &mr->ibmr; error: - /* - * Destroy the umem *before* destroying the MR, to ensure we - * will not have any in-flight notifiers when destroying the - * MR. - * - * As the MR is completely invalid to begin with, and this - * error path is only taken if we can't push the mr entry into - * the pagefault tree, this is safe. - */ - ib_umem_release(umem); - /* Kill the MR, and return an error code. */ - clean_mr(mr); return ERR_PTR(err); } Patches currently in stable-queue which might be from haggaie@xxxxxxxxxxxx are queue-4.2/ib-mlx5-avoid-destroying-a-null-mr-in-reg_user_mr-error-flow.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html