From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ale.deltatee.com (ale.deltatee.com. [207.54.116.67]) by gmr-mx.google.com with ESMTPS id 125si1512itx.5.2017.06.28.20.26.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Jun 2017 20:26:59 -0700 (PDT) From: Logan Gunthorpe Date: Wed, 28 Jun 2017 21:26:38 -0600 Message-Id: <20170629032648.3073-7-logang@deltatee.com> In-Reply-To: <20170629032648.3073-1-logang@deltatee.com> References: <20170629032648.3073-1-logang@deltatee.com> Subject: [PATCH 06/16] ntb: add check and comment for link up to mw_count and mw_get_align To: linux-ntb@googlegroups.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jon Mason , Dave Jiang , Allen Hubbe , Bjorn Helgaas , Greg Kroah-Hartman , Kurt Schwemmer , Stephen Bates , Serge Semin , Logan Gunthorpe List-ID: This patch adds a comment and a check to the ntb_mw_get_align and ntb_mw_count functions so that they always fail if the function is called before the link is up. This is to prevent accidental mis-use in clients that are testing on hardware that this doesn't matter for. Signed-off-by: Logan Gunthorpe --- include/linux/ntb.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/include/linux/ntb.h b/include/linux/ntb.h index 609e232c00da..de4f800c82b6 100644 --- a/include/linux/ntb.h +++ b/include/linux/ntb.h @@ -730,12 +730,16 @@ static inline int ntb_link_disable(struct ntb_dev *ntb) * Hardware and topology may support a different number of memory windows. * Moreover different peer devices can support different number of memory * windows. Simply speaking this method returns the number of possible inbound - * memory windows to share with specified peer device. + * memory windows to share with specified peer device. Note: this must only be + * called when the link is up. * * Return: the number of memory windows. */ static inline int ntb_mw_count(struct ntb_dev *ntb, int pidx) { + if (!(ntb_link_is_up(ntb, NULL, NULL) & (1 << pidx))) + return 0; + return ntb->ops->mw_count(ntb, pidx); } @@ -751,7 +755,7 @@ static inline int ntb_mw_count(struct ntb_dev *ntb, int pidx) * Get the alignments of an inbound memory window with specified index. * NULL may be given for any output parameter if the value is not needed. * The alignment and size parameters may be used for allocation of proper - * shared memory. + * shared memory. Note: this must only be called when the link is up. * * Return: Zero on success, otherwise a negative error number. */ @@ -760,6 +764,9 @@ static inline int ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int widx, resource_size_t *size_align, resource_size_t *size_max) { + if (!(ntb_link_is_up(ntb, NULL, NULL) & (1 << pidx))) + return -ENOTCONN; + return ntb->ops->mw_get_align(ntb, pidx, widx, addr_align, size_align, size_max); } -- 2.11.0