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Date:   Thu, 3 Jan 2019 06:52:58 +0000
From:   Madalin-cristian Bucur <madalin.bucur@....com>
To:     Scott Wood <oss@...error.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH] fsl/fman: Use GFP_ATOMIC in
 {memac,tgec}_add_hash_mac_address()

> -----Original Message-----
> From: Scott Wood <oss@...error.net>
> Sent: Friday, December 28, 2018 2:29 AM
> To: Madalin-cristian Bucur <madalin.bucur@....com>
> Cc: netdev@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org
> Subject: [PATCH] fsl/fman: Use GFP_ATOMIC in
> {memac,tgec}_add_hash_mac_address()
> 
> These functions are called from atomic context:
> 
> [    9.150239] BUG: sleeping function called from invalid context at
> /home/scott/git/linux/mm/slab.h:421
> [    9.158159] in_atomic(): 1, irqs_disabled(): 0, pid: 4432, name: ip
> [    9.163128] CPU: 8 PID: 4432 Comm: ip Not tainted 4.20.0-rc2-00169-
> g63d86876f324 #29
> [    9.163130] Call Trace:
> [    9.170701] [c0000002e899a980] [c0000000009c1068] .dump_stack+0xa8/0xec
> (unreliable)
> [    9.177140] [c0000002e899aa10] [c00000000007a7b4]
> .___might_sleep+0x138/0x164
> [    9.184440] [c0000002e899aa80] [c0000000001d5bac]
> .kmem_cache_alloc_trace+0x238/0x30c
> [    9.191216] [c0000002e899ab40] [c00000000065ea1c]
> .memac_add_hash_mac_address+0x104/0x198
> [    9.199464] [c0000002e899abd0] [c00000000065a788]
> .set_multi+0x1c8/0x218
> [    9.206242] [c0000002e899ac80] [c0000000006615ec]
> .dpaa_set_rx_mode+0xdc/0x17c
> [    9.213544] [c0000002e899ad00] [c00000000083d2b0]
> .__dev_set_rx_mode+0x80/0xd4
> [    9.219535] [c0000002e899ad90] [c00000000083d334]
> .dev_set_rx_mode+0x30/0x54
> [    9.225271] [c0000002e899ae10] [c00000000083d4a0]
> .__dev_open+0x148/0x1c8
> [    9.230751] [c0000002e899aeb0] [c00000000083d934]
> .__dev_change_flags+0x19c/0x1e0
> [    9.230755] [c0000002e899af60] [c00000000083d9a4]
> .dev_change_flags+0x2c/0x80
> [    9.242752] [c0000002e899aff0] [c0000000008554ec]
> .do_setlink+0x350/0xf08
> [    9.248228] [c0000002e899b170] [c000000000857ad0]
> .rtnl_newlink+0x588/0x7e0
> [    9.253965] [c0000002e899b740] [c000000000852424]
> .rtnetlink_rcv_msg+0x3e0/0x498
> [    9.261440] [c0000002e899b820] [c000000000884790]
> .netlink_rcv_skb+0x134/0x14c
> [    9.267607] [c0000002e899b8e0] [c000000000851840]
> .rtnetlink_rcv+0x18/0x2c
> [    9.274558] [c0000002e899b950] [c000000000883c8c]
> .netlink_unicast+0x214/0x318
> [    9.281163] [c0000002e899ba00] [c000000000884220]
> .netlink_sendmsg+0x348/0x444
> [    9.287076] [c0000002e899bae0] [c00000000080d13c]
> .sock_sendmsg+0x2c/0x54
> [    9.287080] [c0000002e899bb50] [c0000000008106c0]
> .___sys_sendmsg+0x2d0/0x2d8
> [    9.298375] [c0000002e899bd30] [c000000000811a80]
> .__sys_sendmsg+0x5c/0xb0
> [    9.303939] [c0000002e899be20] [c0000000000006b0] system_call+0x60/0x6c
> 
> Signed-off-by: Scott Wood <oss@...error.net>
> ---
>  drivers/net/ethernet/freescale/fman/fman_memac.c | 2 +-
>  drivers/net/ethernet/freescale/fman/fman_tgec.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fman/fman_memac.c
> b/drivers/net/ethernet/freescale/fman/fman_memac.c
> index bc6eb30aa20f..41c6fa200e74 100644
> --- a/drivers/net/ethernet/freescale/fman/fman_memac.c
> +++ b/drivers/net/ethernet/freescale/fman/fman_memac.c
> @@ -928,7 +928,7 @@ int memac_add_hash_mac_address(struct fman_mac *memac,
> enet_addr_t *eth_addr)
>  	hash = get_mac_addr_hash_code(addr) & HASH_CTRL_ADDR_MASK;
> 
>  	/* Create element to be added to the driver hash table */
> -	hash_entry = kmalloc(sizeof(*hash_entry), GFP_KERNEL);
> +	hash_entry = kmalloc(sizeof(*hash_entry), GFP_ATOMIC);
>  	if (!hash_entry)
>  		return -ENOMEM;
>  	hash_entry->addr = addr;
> diff --git a/drivers/net/ethernet/freescale/fman/fman_tgec.c
> b/drivers/net/ethernet/freescale/fman/fman_tgec.c
> index 40705938eecc..f75b9c11b2d2 100644
> --- a/drivers/net/ethernet/freescale/fman/fman_tgec.c
> +++ b/drivers/net/ethernet/freescale/fman/fman_tgec.c
> @@ -553,7 +553,7 @@ int tgec_add_hash_mac_address(struct fman_mac *tgec,
> enet_addr_t *eth_addr)
>  	hash = (crc >> TGEC_HASH_MCAST_SHIFT) & TGEC_HASH_ADR_MSK;
> 
>  	/* Create element to be added to the driver hash table */
> -	hash_entry = kmalloc(sizeof(*hash_entry), GFP_KERNEL);
> +	hash_entry = kmalloc(sizeof(*hash_entry), GFP_ATOMIC);
>  	if (!hash_entry)
>  		return -ENOMEM;
>  	hash_entry->addr = addr;
> --
> 2.17.1

Thank you

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