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So if a system bus error occurs, reading the register will get the SBE bit set. However, the current implementation directly uses the register value as the consumer index without masking it. Therefore, if a system bus error occurs, an incorrect consumer index will be obtained, causing errors in the processing of the command BD ring. Thus, we need to mask out the other bits to obtain the correct consumer index. Fixes: 4701073c3deb ("net: enetc: add initial netc-lib driver to support NTMP") Signed-off-by: Wei Fang --- drivers/net/ethernet/freescale/enetc/ntmp.c | 7 ++++--- drivers/net/ethernet/freescale/enetc/ntmp_private.h | 1 + 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/ntmp.c b/drivers/net/ethernet/freescale/enetc/ntmp.c index 0c1d343253bf..1b1ff0446d0a 100644 --- a/drivers/net/ethernet/freescale/enetc/ntmp.c +++ b/drivers/net/ethernet/freescale/enetc/ntmp.c @@ -55,7 +55,7 @@ int ntmp_init_cbdr(struct netc_cbdr *cbdr, struct device *dev, spin_lock_init(&cbdr->ring_lock); cbdr->next_to_use = netc_read(cbdr->regs.pir); - cbdr->next_to_clean = netc_read(cbdr->regs.cir); + cbdr->next_to_clean = netc_read(cbdr->regs.cir) & NETC_CBDRCIR_INDEX; /* Step 1: Configure the base address of the Control BD Ring */ netc_write(cbdr->regs.bar0, lower_32_bits(cbdr->dma_base_align)); @@ -98,7 +98,7 @@ static void ntmp_clean_cbdr(struct netc_cbdr *cbdr) int i; i = cbdr->next_to_clean; - while (netc_read(cbdr->regs.cir) != i) { + while ((netc_read(cbdr->regs.cir) & NETC_CBDRCIR_INDEX) != i) { cbd = ntmp_get_cbd(cbdr, i); memset(cbd, 0, sizeof(*cbd)); i = (i + 1) % cbdr->bd_num; @@ -135,7 +135,8 @@ static int netc_xmit_ntmp_cmd(struct ntmp_user *user, union netc_cbd *cbd) cbdr->next_to_use = i; netc_write(cbdr->regs.pir, i); - err = read_poll_timeout_atomic(netc_read, val, val == i, + err = read_poll_timeout_atomic(netc_read, val, + (val & NETC_CBDRCIR_INDEX) == i, NETC_CBDR_DELAY_US, NETC_CBDR_TIMEOUT, true, cbdr->regs.cir); if (unlikely(err)) diff --git a/drivers/net/ethernet/freescale/enetc/ntmp_private.h b/drivers/net/ethernet/freescale/enetc/ntmp_private.h index 34394e40fddd..7a53db8740db 100644 --- a/drivers/net/ethernet/freescale/enetc/ntmp_private.h +++ b/drivers/net/ethernet/freescale/enetc/ntmp_private.h @@ -12,6 +12,7 @@ #define NTMP_EID_REQ_LEN 8 #define NETC_CBDR_BD_NUM 256 +#define NETC_CBDRCIR_INDEX GENMASK(9, 0) union netc_cbd { struct { -- 2.34.1