ibmvnic: don't release napi in __ibmvnic_open()

[ Upstream commit 61772b0908 ]

If __ibmvnic_open() encounters an error such as when setting link state,
it calls release_resources() which frees the napi structures needlessly.
Instead, have __ibmvnic_open() only clean up the work it did so far (i.e.
disable napi and irqs) and leave the rest to the callers.

If caller of __ibmvnic_open() is ibmvnic_open(), it should release the
resources immediately. If the caller is do_reset() or do_hard_reset(),
they will release the resources on the next reset.

This fixes following crash that occurred when running the drmgr command
several times to add/remove a vnic interface:

	[102056] ibmvnic 30000003 env3: Disabling rx_scrq[6] irq
	[102056] ibmvnic 30000003 env3: Disabling rx_scrq[7] irq
	[102056] ibmvnic 30000003 env3: Replenished 8 pools
	Kernel attempted to read user page (10) - exploit attempt? (uid: 0)
	BUG: Kernel NULL pointer dereference on read at 0x00000010
	Faulting instruction address: 0xc000000000a3c840
	Oops: Kernel access of bad area, sig: 11 [#1]
	LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
	...
	CPU: 9 PID: 102056 Comm: kworker/9:2 Kdump: loaded Not tainted 5.16.0-rc5-autotest-g6441998e2e37 #1
	Workqueue: events_long __ibmvnic_reset [ibmvnic]
	NIP:  c000000000a3c840 LR: c0080000029b5378 CTR: c000000000a3c820
	REGS: c0000000548e37e0 TRAP: 0300   Not tainted  (5.16.0-rc5-autotest-g6441998e2e37)
	MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 28248484  XER: 00000004
	CFAR: c0080000029bdd24 DAR: 0000000000000010 DSISR: 40000000 IRQMASK: 0
	GPR00: c0080000029b55d0 c0000000548e3a80 c0000000028f0200 0000000000000000
	...
	NIP [c000000000a3c840] napi_enable+0x20/0xc0
	LR [c0080000029b5378] __ibmvnic_open+0xf0/0x430 [ibmvnic]
	Call Trace:
	[c0000000548e3a80] [0000000000000006] 0x6 (unreliable)
	[c0000000548e3ab0] [c0080000029b55d0] __ibmvnic_open+0x348/0x430 [ibmvnic]
	[c0000000548e3b40] [c0080000029bcc28] __ibmvnic_reset+0x500/0xdf0 [ibmvnic]
	[c0000000548e3c60] [c000000000176228] process_one_work+0x288/0x570
	[c0000000548e3d00] [c000000000176588] worker_thread+0x78/0x660
	[c0000000548e3da0] [c0000000001822f0] kthread+0x1c0/0x1d0
	[c0000000548e3e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64
	Instruction dump:
	7d2948f8 792307e0 4e800020 60000000 3c4c01eb 384239e0 f821ffd1 39430010
	38a0fff6 e92d1100 f9210028 39200000 <e9030010> f9010020 60420000 e9210020
	---[ end trace 5f8033b08fd27706 ]---

Fixes: ed651a1087 ("ibmvnic: Updated reset handling")
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Reviewed-by: Dany Madden <drt@linux.ibm.com>
Link: https://lore.kernel.org/r/20220208001918.900602-1-sukadev@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sukadev Bhattiprolu 2022-02-07 16:19:18 -08:00 коммит произвёл Greg Kroah-Hartman
Родитель 1d13e72210
Коммит 960dfaf3b5
1 изменённых файлов: 7 добавлений и 2 удалений

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@ -108,6 +108,7 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter);
static int send_query_phys_parms(struct ibmvnic_adapter *adapter); static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter, static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
struct ibmvnic_sub_crq_queue *tx_scrq); struct ibmvnic_sub_crq_queue *tx_scrq);
static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
struct ibmvnic_stat { struct ibmvnic_stat {
char name[ETH_GSTRING_LEN]; char name[ETH_GSTRING_LEN];
@ -1245,7 +1246,7 @@ static int __ibmvnic_open(struct net_device *netdev)
rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP); rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
if (rc) { if (rc) {
ibmvnic_napi_disable(adapter); ibmvnic_napi_disable(adapter);
release_resources(adapter); ibmvnic_disable_irqs(adapter);
return rc; return rc;
} }
@ -1295,7 +1296,6 @@ static int ibmvnic_open(struct net_device *netdev)
rc = init_resources(adapter); rc = init_resources(adapter);
if (rc) { if (rc) {
netdev_err(netdev, "failed to initialize resources\n"); netdev_err(netdev, "failed to initialize resources\n");
release_resources(adapter);
goto out; goto out;
} }
} }
@ -1312,6 +1312,11 @@ out:
adapter->state = VNIC_OPEN; adapter->state = VNIC_OPEN;
rc = 0; rc = 0;
} }
if (rc) {
release_resources(adapter);
}
return rc; return rc;
} }