From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Russell King <rmk+kernel@armlinux.org.uk>,
Andrew Lunn <andrew@lunn.ch>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 10/51] net: sfp: read eeprom in maximum 16 byte increments
Date: Sun, 9 Jun 2019 18:41:51 +0200 [thread overview]
Message-ID: <20190609164127.735353425@linuxfoundation.org> (raw)
In-Reply-To: <20190609164127.123076536@linuxfoundation.org>
From: Russell King <rmk+kernel@armlinux.org.uk>
[ Upstream commit 28e74a7cfd6403f0d1c0f8b10b45d6fae37b227e ]
Some SFP modules do not like reads longer than 16 bytes, so read the
EEPROM in chunks of 16 bytes at a time. This behaviour is not specified
in the SFP MSAs, which specifies:
"The serial interface uses the 2-wire serial CMOS E2PROM protocol
defined for the ATMEL AT24C01A/02/04 family of components."
and
"As long as the SFP+ receives an acknowledge, it shall serially clock
out sequential data words. The sequence is terminated when the host
responds with a NACK and a STOP instead of an acknowledge."
We must avoid breaking a read across a 16-bit quantity in the diagnostic
page, thankfully all 16-bit quantities in that page are naturally
aligned.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/sfp.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -280,6 +280,7 @@ static int sfp_i2c_read(struct sfp *sfp,
{
struct i2c_msg msgs[2];
u8 bus_addr = a2 ? 0x51 : 0x50;
+ size_t this_len;
int ret;
msgs[0].addr = bus_addr;
@@ -291,11 +292,26 @@ static int sfp_i2c_read(struct sfp *sfp,
msgs[1].len = len;
msgs[1].buf = buf;
- ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
- if (ret < 0)
- return ret;
+ while (len) {
+ this_len = len;
+ if (this_len > 16)
+ this_len = 16;
- return ret == ARRAY_SIZE(msgs) ? len : 0;
+ msgs[1].len = this_len;
+
+ ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0)
+ return ret;
+
+ if (ret != ARRAY_SIZE(msgs))
+ break;
+
+ msgs[1].buf += this_len;
+ dev_addr += this_len;
+ len -= this_len;
+ }
+
+ return msgs[1].buf - (u8 *)buf;
}
static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
next prev parent reply other threads:[~2019-06-09 16:48 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-09 16:41 [PATCH 4.19 00/51] 4.19.50-stable review Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 01/51] ethtool: fix potential userspace buffer overflow Greg Kroah-Hartman
2019-06-10 8:21 ` Pavel Machek
2019-06-10 8:42 ` Michal Kubecek
2019-06-10 14:23 ` Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 02/51] Fix memory leak in sctp_process_init Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 03/51] ipv4: not do cache for local delivery if bc_forwarding is enabled Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 04/51] ipv6: fix the check before getting the cookie in rt6_get_cookie Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 05/51] neighbor: Call __ipv4_neigh_lookup_noref in neigh_xmit Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 06/51] net: ethernet: ti: cpsw_ethtool: fix ethtool ring param set Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 07/51] net/mlx4_en: ethtool, Remove unsupported SFP EEPROM high pages query Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 08/51] net: mvpp2: Use strscpy to handle stat strings Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 09/51] net: rds: fix memory leak in rds_ib_flush_mr_pool Greg Kroah-Hartman
2019-06-09 16:41 ` Greg Kroah-Hartman [this message]
2019-06-09 16:41 ` [PATCH 4.19 11/51] net/tls: replace the sleeping lock around RX resync with a bit lock Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 12/51] packet: unconditionally free po->rollover Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 13/51] pktgen: do not sleep with the thread lock held Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 14/51] Revert "fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied" Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 15/51] ipv6: use READ_ONCE() for inet->hdrincl as in ipv4 Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 16/51] ipv6: fix EFAULT on sendto with icmpv6 and hdrincl Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 17/51] mtd: spinand: macronix: Fix ECC Status Read Greg Kroah-Hartman
2019-06-09 16:41 ` [PATCH 4.19 18/51] rcu: locking and unlocking need to always be at least barriers Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 19/51] parisc: Use implicit space register selection for loading the coherence index of I/O pdirs Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 20/51] NFSv4.1: Again fix a race where CB_NOTIFY_LOCK fails to wake a waiter Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 21/51] NFSv4.1: Fix bug only first CB_NOTIFY_LOCK is handled Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 22/51] fuse: fallocate: fix return with locked inode Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 23/51] pstore: Remove needless lock during console writes Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 24/51] pstore: Convert buf_lock to semaphore Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 25/51] pstore: Set tfm to NULL on free_buf_for_compression Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 26/51] pstore/ram: Run without kernel crash dump region Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 27/51] x86/power: Fix nosmt vs hibernation triple fault during resume Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 28/51] x86/insn-eval: Fix use-after-free access to LDT entry Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 29/51] i2c: xiic: Add max_read_len quirk Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 30/51] s390/mm: fix address space detection in exception handling Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 31/51] xen-blkfront: switch kcalloc to kvcalloc for large array allocation Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 32/51] MIPS: Bounds check virt_addr_valid Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 33/51] MIPS: pistachio: Build uImage.gz by default Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 34/51] Revert "MIPS: perf: ath79: Fix perfcount IRQ assignment" Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 35/51] genwqe: Prevent an integer overflow in the ioctl Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 36/51] test_firmware: Use correct snprintf() limit Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 37/51] drm/gma500/cdv: Check vbt config bits when detecting lvds panels Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 38/51] drm/msm: fix fb references in async update Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 39/51] drm: add non-desktop quirk for Valve HMDs Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 40/51] drm/nouveau: add kconfig option to turn off nouveau legacy contexts. (v3) Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 41/51] drm: add non-desktop quirks to Sensics and OSVR headsets Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 42/51] drm/amdgpu/psp: move psp version specific function pointers to early_init Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 43/51] drm/radeon: prefer lower reference dividers Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 44/51] drm/amdgpu: remove ATPX_DGPU_REQ_POWER_FOR_DISPLAYS check when hotplug-in Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 45/51] drm/i915: Fix I915_EXEC_RING_MASK Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 46/51] drm/amdgpu/soc15: skip reset on init Greg Kroah-Hartman
2019-06-10 14:31 ` Pavel Machek
2019-06-10 14:41 ` Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 47/51] drm/i915/fbc: disable framebuffer compression on GeminiLake Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 48/51] drm/i915: Maintain consistent documentation subsection ordering Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 49/51] drm: dont block fb changes for async plane updates Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 50/51] drm/i915/gvt: Initialize intel_gvt_gtt_entry in stack Greg Kroah-Hartman
2019-06-09 16:42 ` [PATCH 4.19 51/51] TTY: serial_core, add ->install Greg Kroah-Hartman
2019-06-10 8:09 ` [PATCH 4.19 00/51] 4.19.50-stable review Naresh Kamboju
2019-06-10 8:51 ` Jon Hunter
2019-06-10 14:43 ` Guenter Roeck
2019-06-10 21:57 ` shuah
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190609164127.735353425@linuxfoundation.org \
--to=gregkh@linuxfoundation.org \
--cc=andrew@lunn.ch \
--cc=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=rmk+kernel@armlinux.org.uk \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).