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Peter Anvin" , Niklas Schnelle , Thomas Bogendoerfer , Michael Ellerman Date: Thu, 15 Jul 2021 10:45:42 -0600 Message-Id: <20210715164544.6827-15-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210715164544.6827-1-logang@deltatee.com> References: <20210715164544.6827-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, sbates@raithlin.com, martin.oliveira@eideticom.com, logang@deltatee.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, schnelle@linux.ibm.com, tsbogend@alpha.franken.de, mpe@ellerman.id.au X-SA-Exim-Mail-From: gunthorp@deltatee.com X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on ale.deltatee.com X-Spam-Level: X-Spam-Status: No, score=-6.7 required=5.0 tests=ALL_TRUSTED,BAYES_00, MYRULES_NO_TEXT autolearn=no autolearn_force=no version=3.4.2 Subject: [PATCH v1 14/16] x86/amd_gart: return error code from gart_map_sg() X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-ZohoMail-DKIM: pass (identity @deltatee.com) X-ZM-MESSAGEID: 1626367615387100001 Content-Type: text/plain; charset="utf-8" From: Martin Oliveira The .map_sg() op now expects an error code instead of zero on failure. So make __dma_map_cont() return a valid errno (which is then propagated to gart_map_sg() via dma_map_cont()) and return it in case of failure. Also, return -EINVAL in case of invalid nents. Signed-off-by: Martin Oliveira Signed-off-by: Logan Gunthorpe Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Niklas Schnelle Cc: Thomas Bogendoerfer Cc: Michael Ellerman --- arch/x86/kernel/amd_gart_64.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c index 9ac696487b13..46aea9a4f26b 100644 --- a/arch/x86/kernel/amd_gart_64.c +++ b/arch/x86/kernel/amd_gart_64.c @@ -331,7 +331,7 @@ static int __dma_map_cont(struct device *dev, struct sc= atterlist *start, int i; =20 if (iommu_start =3D=3D -1) - return -1; + return -ENOMEM; =20 for_each_sg(start, s, nelems, i) { unsigned long pages, addr; @@ -380,13 +380,13 @@ static int gart_map_sg(struct device *dev, struct sca= tterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *s, *ps, *start_sg, *sgmap; - int need =3D 0, nextneed, i, out, start; + int need =3D 0, nextneed, i, out, start, ret; unsigned long pages =3D 0; unsigned int seg_size; unsigned int max_seg_size; =20 if (nents =3D=3D 0) - return 0; + return -EINVAL; =20 out =3D 0; start =3D 0; @@ -414,8 +414,9 @@ static int gart_map_sg(struct device *dev, struct scatt= erlist *sg, int nents, if (!iommu_merge || !nextneed || !need || s->offset || (s->length + seg_size > max_seg_size) || (ps->offset + ps->length) % PAGE_SIZE) { - if (dma_map_cont(dev, start_sg, i - start, - sgmap, pages, need) < 0) + ret =3D dma_map_cont(dev, start_sg, i - start, + sgmap, pages, need); + if (ret < 0) goto error; out++; =20 @@ -432,7 +433,8 @@ static int gart_map_sg(struct device *dev, struct scatt= erlist *sg, int nents, pages +=3D iommu_num_pages(s->offset, s->length, PAGE_SIZE); ps =3D s; } - if (dma_map_cont(dev, start_sg, i - start, sgmap, pages, need) < 0) + ret =3D dma_map_cont(dev, start_sg, i - start, sgmap, pages, need); + if (ret < 0) goto error; out++; flush_gart(); @@ -458,7 +460,7 @@ static int gart_map_sg(struct device *dev, struct scatt= erlist *sg, int nents, iommu_full(dev, pages << PAGE_SHIFT, dir); for_each_sg(sg, s, nents, i) s->dma_address =3D DMA_MAPPING_ERROR; - return 0; + return ret; } =20 /* allocate and map a coherent mapping */ --=20 2.20.1