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ravb: do not write 1 to reserved bits

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[ Upstream commit 2fe397a395 ]

EtherAVB hardware requires 0 to be written to status register bits in
order to clear them, however, care must be taken not to:

1. Clear other bits, by writing zero to them
2. Write one to reserved bits

This patch corrects the ravb driver with respect to the second point above.
This is done by defining reserved bit masks for the affected registers and,
after auditing the code, ensure all sites that may write a one to a
reserved bit use are suitably masked.

Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kazuya Mizuguchi
2018-09-18 12:22:26 +02:00
committed by Greg Kroah-Hartman
parent e6c1b1555f
commit 51ddce702e
3 changed files with 12 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/ethernet/renesas/ravb.h
View File

@@ -421,6 +421,7 @@ enum EIS_BIT {
EIS_CULF1 = 0x00000080,
EIS_TFFF = 0x00000100,
EIS_QFS = 0x00010000,
EIS_RESERVED = (GENMASK(31, 17) | GENMASK(15, 11)),
};
/* RIC0 */
@@ -465,6 +466,7 @@ enum RIS0_BIT {
RIS0_FRF15 = 0x00008000,
RIS0_FRF16 = 0x00010000,
RIS0_FRF17 = 0x00020000,
RIS0_RESERVED = GENMASK(31, 18),
};
/* RIC1 */
@@ -521,6 +523,7 @@ enum RIS2_BIT {
RIS2_QFF16 = 0x00010000,
RIS2_QFF17 = 0x00020000,
RIS2_RFFF = 0x80000000,
RIS2_RESERVED = GENMASK(30, 18),
};
/* TIC */
@@ -537,6 +540,7 @@ enum TIS_BIT {
TIS_FTF1 = 0x00000002, /* Undocumented? */
TIS_TFUF = 0x00000100,
TIS_TFWF = 0x00000200,
TIS_RESERVED = (GENMASK(31, 20) | GENMASK(15, 12) | GENMASK(7, 4))
};
/* ISS */
@@ -610,6 +614,7 @@ enum GIC_BIT {
enum GIS_BIT {
GIS_PTCF = 0x00000001, /* Undocumented? */
GIS_PTMF = 0x00000004,
GIS_RESERVED = GENMASK(15, 10),
};
/* GIE (R-Car Gen3 only) */

11
drivers/net/ethernet/renesas/ravb_main.c
View File

@@ -717,10 +717,11 @@ static void ravb_error_interrupt(struct net_device *ndev)
u32 eis, ris2;
eis = ravb_read(ndev, EIS);
ravb_write(ndev, ~EIS_QFS, EIS);
ravb_write(ndev, ~(EIS_QFS | EIS_RESERVED), EIS);
if (eis & EIS_QFS) {
ris2 = ravb_read(ndev, RIS2);
ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF), RIS2);
ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF | RIS2_RESERVED),
RIS2);
/* Receive Descriptor Empty int */
if (ris2 & RIS2_QFF0)
@@ -773,7 +774,7 @@ static bool ravb_timestamp_interrupt(struct net_device *ndev)
u32 tis = ravb_read(ndev, TIS);
if (tis & TIS_TFUF) {
ravb_write(ndev, ~TIS_TFUF, TIS);
ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
ravb_get_tx_tstamp(ndev);
return true;
}
@@ -908,7 +909,7 @@ static int ravb_poll(struct napi_struct *napi, int budget)
/* Processing RX Descriptor Ring */
if (ris0 & mask) {
/* Clear RX interrupt */
ravb_write(ndev, ~mask, RIS0);
ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
if (ravb_rx(ndev, &quota, q))
goto out;
}
@@ -916,7 +917,7 @@ static int ravb_poll(struct napi_struct *napi, int budget)
if (tis & mask) {
spin_lock_irqsave(&priv->lock, flags);
/* Clear TX interrupt */
ravb_write(ndev, ~mask, TIS);
ravb_write(ndev, ~(mask | TIS_RESERVED), TIS);
ravb_tx_free(ndev, q, true);
netif_wake_subqueue(ndev, q);
mmiowb();

2
drivers/net/ethernet/renesas/ravb_ptp.c
View File

@@ -319,7 +319,7 @@ void ravb_ptp_interrupt(struct net_device *ndev)
}
}
ravb_write(ndev, ~gis, GIS);
ravb_write(ndev, ~(gis | GIS_RESERVED), GIS);
}
void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)