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Miller" , Sasha Levin Subject: [PATCH 4.9 091/125] sfc: suppress duplicate nvmem partition types in efx_ef10_mtd_probe Date: Wed, 4 Dec 2019 18:56:36 +0100 Message-Id: <20191204175324.600134980@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191204175308.377746305@linuxfoundation.org> References: <20191204175308.377746305@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Edward Cree [ Upstream commit 3366463513f544c12c6b88c13da4462ee9e7a1a1 ] Use a bitmap to keep track of which partition types we've already seen; for duplicates, return -EEXIST from efx_ef10_mtd_probe_partition() and thus skip adding that partition. Duplicate partitions occur because of the A/B backup scheme used by newer sfc NICs. Prior to this patch they cause sysfs_warn_dup errors because they have the same name, causing us not to expose any MTDs at all. Signed-off-by: Edward Cree Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/sfc/ef10.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 3d5d5d54c1033..34e2256c93f46 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -5093,22 +5093,25 @@ static const struct efx_ef10_nvram_type_info efx_ef10_nvram_types[] = { { NVRAM_PARTITION_TYPE_LICENSE, 0, 0, "sfc_license" }, { NVRAM_PARTITION_TYPE_PHY_MIN, 0xff, 0, "sfc_phy_fw" }, }; +#define EF10_NVRAM_PARTITION_COUNT ARRAY_SIZE(efx_ef10_nvram_types) static int efx_ef10_mtd_probe_partition(struct efx_nic *efx, struct efx_mcdi_mtd_partition *part, - unsigned int type) + unsigned int type, + unsigned long *found) { MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_METADATA_IN_LEN); MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_METADATA_OUT_LENMAX); const struct efx_ef10_nvram_type_info *info; size_t size, erase_size, outlen; + int type_idx = 0; bool protected; int rc; - for (info = efx_ef10_nvram_types; ; info++) { - if (info == - efx_ef10_nvram_types + ARRAY_SIZE(efx_ef10_nvram_types)) + for (type_idx = 0; ; type_idx++) { + if (type_idx == EF10_NVRAM_PARTITION_COUNT) return -ENODEV; + info = efx_ef10_nvram_types + type_idx; if ((type & ~info->type_mask) == info->type) break; } @@ -5121,6 +5124,13 @@ static int efx_ef10_mtd_probe_partition(struct efx_nic *efx, if (protected) return -ENODEV; /* hide it */ + /* If we've already exposed a partition of this type, hide this + * duplicate. All operations on MTDs are keyed by the type anyway, + * so we can't act on the duplicate. + */ + if (__test_and_set_bit(type_idx, found)) + return -EEXIST; + part->nvram_type = type; MCDI_SET_DWORD(inbuf, NVRAM_METADATA_IN_TYPE, type); @@ -5149,6 +5159,7 @@ static int efx_ef10_mtd_probe_partition(struct efx_nic *efx, static int efx_ef10_mtd_probe(struct efx_nic *efx) { MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_PARTITIONS_OUT_LENMAX); + DECLARE_BITMAP(found, EF10_NVRAM_PARTITION_COUNT); struct efx_mcdi_mtd_partition *parts; size_t outlen, n_parts_total, i, n_parts; unsigned int type; @@ -5177,11 +5188,13 @@ static int efx_ef10_mtd_probe(struct efx_nic *efx) for (i = 0; i < n_parts_total; i++) { type = MCDI_ARRAY_DWORD(outbuf, NVRAM_PARTITIONS_OUT_TYPE_ID, i); - rc = efx_ef10_mtd_probe_partition(efx, &parts[n_parts], type); - if (rc == 0) - n_parts++; - else if (rc != -ENODEV) + rc = efx_ef10_mtd_probe_partition(efx, &parts[n_parts], type, + found); + if (rc == -EEXIST || rc == -ENODEV) + continue; + if (rc) goto fail; + n_parts++; } rc = efx_mtd_add(efx, &parts[0].common, n_parts, sizeof(*parts)); -- 2.20.1