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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-11-13 19:26:27 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-11-15 00:18:17 +0100 |
| commit | 18acfa2597d57c19249346d130fc3334244557b4 (patch) | |
| tree | 5c750625aaa11241c44c6ebc9e40e8074e24d9a2 | |
| parent | 9p: restrict RDMA usage (diff) | |
| download | linux-18acfa2597d57c19249346d130fc3334244557b4.tar.xz linux-18acfa2597d57c19249346d130fc3334244557b4.zip | |
net/ucc_geth: Fix oops in uec_get_ethtool_stats()
p_{tx,rx}_fw_statistics_pram are special: they're available only when
a device is open. If the device is closed, we should just fill the data
with zeroes.
Fixes the following oops:
root@b1:~# ifconfig eth1 down
root@b1:~# ethtool -S eth1
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc01e1dcc
Oops: Kernel access of bad area, sig: 11 [#1]
[...]
NIP [c01e1dcc] uec_get_ethtool_stats+0x98/0x124
LR [c0287cc8] ethtool_get_stats+0xfc/0x23c
Call Trace:
[cfaadde0] [c0287ca8] ethtool_get_stats+0xdc/0x23c (unreliable)
[cfaade20] [c0288340] dev_ethtool+0x2fc/0x588
[cfaade50] [c0285648] dev_ioctl+0x290/0x33c
[cfaadea0] [c0272238] sock_ioctl+0x80/0x2ec
[cfaadec0] [c00b5ae4] vfs_ioctl+0x40/0xc0
[cfaadee0] [c00b5fa8] do_vfs_ioctl+0x78/0x20c
[cfaadf10] [c00b617c] sys_ioctl+0x40/0x74
[cfaadf40] [c00142d8] ret_from_syscall+0x0/0x38
[...]
---[ end trace b941007b2dfb9759 ]---
Segmentation fault
p.s. While at it, also remove u64 casts, they aren't needed.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
| -rw-r--r-- | drivers/net/ucc_geth_ethtool.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ucc_geth_ethtool.c b/drivers/net/ucc_geth_ethtool.c index 85f38a6b6a49..68a7f5414133 100644 --- a/drivers/net/ucc_geth_ethtool.c +++ b/drivers/net/ucc_geth_ethtool.c @@ -323,17 +323,17 @@ static void uec_get_ethtool_stats(struct net_device *netdev, if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_HARDWARE) { base = (u32 __iomem *)&ugeth->ug_regs->tx64; for (i = 0; i < UEC_HW_STATS_LEN; i++) - data[j++] = (u64)in_be32(&base[i]); + data[j++] = in_be32(&base[i]); } if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_TX) { base = (u32 __iomem *)ugeth->p_tx_fw_statistics_pram; for (i = 0; i < UEC_TX_FW_STATS_LEN; i++) - data[j++] = (u64)in_be32(&base[i]); + data[j++] = base ? in_be32(&base[i]) : 0; } if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_RX) { base = (u32 __iomem *)ugeth->p_rx_fw_statistics_pram; for (i = 0; i < UEC_RX_FW_STATS_LEN; i++) - data[j++] = (u64)in_be32(&base[i]); + data[j++] = base ? in_be32(&base[i]) : 0; } } |