From fc89cc358fb64e2429aeae0f37906126636507ec Mon Sep 17 00:00:00 2001 From: Vishal Kulkarni Date: Wed, 30 Oct 2019 20:17:57 +0530 Subject: [PATCH] cxgb4: fix panic when attaching to ULD fail Release resources when attaching to ULD fail. Otherwise, data mismatch is seen between LLD and ULD later on, which lead to kernel panic when accessing resources that should not even exist in the first place. Fixes: 94cdb8bb993a ("cxgb4: Add support for dynamic allocation of resources for ULD") Signed-off-by: Shahjada Abul Husain Signed-off-by: Vishal Kulkarni Signed-off-by: David S. Miller --- .../net/ethernet/chelsio/cxgb4/cxgb4_uld.c | 28 +++++++++++-------- 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c index a4dead4ab0ed..86b528d8364c 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c @@ -695,10 +695,10 @@ static void uld_init(struct adapter *adap, struct cxgb4_lld_info *lld) lld->write_cmpl_support = adap->params.write_cmpl_support; } -static void uld_attach(struct adapter *adap, unsigned int uld) +static int uld_attach(struct adapter *adap, unsigned int uld) { - void *handle; struct cxgb4_lld_info lli; + void *handle; uld_init(adap, &lli); uld_queue_init(adap, uld, &lli); @@ -708,7 +708,7 @@ static void uld_attach(struct adapter *adap, unsigned int uld) dev_warn(adap->pdev_dev, "could not attach to the %s driver, error %ld\n", adap->uld[uld].name, PTR_ERR(handle)); - return; + return PTR_ERR(handle); } adap->uld[uld].handle = handle; @@ -716,22 +716,22 @@ static void uld_attach(struct adapter *adap, unsigned int uld) if (adap->flags & CXGB4_FULL_INIT_DONE) adap->uld[uld].state_change(handle, CXGB4_STATE_UP); + + return 0; } -/** - * cxgb4_register_uld - register an upper-layer driver - * @type: the ULD type - * @p: the ULD methods +/* cxgb4_register_uld - register an upper-layer driver + * @type: the ULD type + * @p: the ULD methods * - * Registers an upper-layer driver with this driver and notifies the ULD - * about any presently available devices that support its type. Returns - * %-EBUSY if a ULD of the same type is already registered. + * Registers an upper-layer driver with this driver and notifies the ULD + * about any presently available devices that support its type. */ void cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p) { - int ret = 0; struct adapter *adap; + int ret = 0; if (type >= CXGB4_ULD_MAX) return; @@ -763,8 +763,12 @@ void cxgb4_register_uld(enum cxgb4_uld type, if (ret) goto free_irq; adap->uld[type] = *p; - uld_attach(adap, type); + ret = uld_attach(adap, type); + if (ret) + goto free_txq; continue; +free_txq: + release_sge_txq_uld(adap, type); free_irq: if (adap->flags & CXGB4_FULL_INIT_DONE) quiesce_rx_uld(adap, type);